/*
 * Flashlib - QB9 common Flash library
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package com.qb9.flashlib.tasks
{
	import flash.events.Event;

	/**
	 * A set of tasks that will run in sequence.
	 *
	 * @see TaskRunner
	 */
	public class Sequence extends Queue
	{
		/**
		 * Create a Sequence task.
		 *
		 * <p>This constructor accepts either an array of ITask objects, or all the
		 * ITasks directly as arguments.</p>
		 */
		public function Sequence(... args)
		{
			super(args);
		}

		/** @inheritDoc */
		public override function clone():ITask
		{
			return new Sequence(cloneSubtasks());
		}
		
		/** @inheritDoc */
		protected override function startNext():void
		{
			if (empty)
				taskComplete();
			else
				super.startNext();				
		}
		
		protected override function calculateConsumed(total:uint, remaining:uint) : uint
		{
			return total - remaining;
		}

	}
}

